7. For each tortino, stack 1 slice each yellow tomato, eggplant, mozzarella, and red tomato, then top with 1 more slice each eggplant and yellow tomato. Set stacks on a platter. Reserve 2 teaspoons of pan juices from tomatoes; use remainder in other salads.

8. In a 2- to 3-quart pan over high heat, boil vinegar until reduced to 2 tablespoons, 5 to 7 minutes, stirring as it nears the end of cooking.

9. Mix the reserved tomato juices with vinegar and drizzle over tortinos. Garnish with thyme sprigs.